fifth wheel coupling and rear suspension with axles and wheels of big rig semi truck tractor

american anticipatory assemblies attention automobile axles back big cargo carrier carrying cautionary commercial conveyance coupling delivering delivery destination drive duty eighteen equipment fifth fleet freight haul heavy industrial industry inspection loads logistic logistics long lorry lubricate lubricated maintenance off out parking protection rig rigs road roadside safety semi service servicing shipping stand standing stop suspension tractor traffic trailer trailers transport transportation transporter transporting travel truck trucking trucks view waiting warning wheel wheeler